Other than McCartney I can't think of left handed bassists. A certain percent of people are left handed but most are right handed. I wonder if that holds true for musicians. My son is left handed but he plays right handed when playing guitar or bass so I don't think that counts.

My eldest son is a leftie, but apparently NO-ONE plays upright bass as a leftie. He played upright bass for four years before he got a bass guitar. When he got the bass guitar, he played it as a rightie, because he was used to plucking with his right hand.

The weirdest thing is watching him play acoustic guitar. All three acoustics in the house are righties. If it is just a strumming tune, he plays it as a leftie, upside down. But when it gets into more complex picking, he swaps back to a rightie configuration, 'cause he does his bass picking with his right hand. It looks really strange when he starts swapping mid song!